Grinding machine



Nov. 17, 1931. J. E. PETERSON GRINDING MACHINE Filed July 1o-. 1930 2 Sheets-Sheet 1 1,7 2 avwemfioz,

Joint f. Peara Nov. 17, 1931. J. E. PETERSON GRINDING MACHINE Filed July 10. 1930 2 Sheets-Sheet 2 Patented Nov. 17, 1931 UNITED STATES PATENT OFFICE JOHN E. PETERSON, OF IRVINGTON, NEW JERSEY, ASSIGNOR TO VAN VLAANDEBEN MA- CHINE COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY GRINDING MACHINE 1 Application filed July 10, 1930. Serial No. 467,013.

In a known type of tentering clip for cloth tentering machines a pivoted jaw has a bladelike portion formed with a double-bevel edge to coact with the platform or fixed aw of the clip. This edge becomes dulled or rounded in use and it is the object of this invention to provide a machine in which both surfaces forming the edge can be ground so as to restore the edge to its intended sharpness and 1a with the assurance that it will be perfectly straight and in true parallelism with the fixed jaw or platform of the clip. At present this work is done by hand; there is a large number of clips required for each tentering machine. so that much time is expended in restoring them to proper working condition and frequently the edges will not be ground straight or so as to meet squarely the coacting surface of the fixed jaw of the clip.

In the accompanying drawings,

Fig. 1 is a plan of the machine, with spindle 11 removed;

Fig. 2 is a side elevation, with the jaw to be ground in place therein;

Fig. 3' is a right-hand end elevation, also showing the jaw in place;

Fig. 4 is a section on line 4 1, Fig. 3; and

Fig. 5 is a similar section, the jaw being in reversed position.

The frame 1 of the machine includes a base 2 on which is an electric motor 3 whose shaft 4 carries a grinding wheel 5, the axis of the motor being here horizontal. The frame also includes a rectilineal guideway 6 arranged horizontally and here at right angles to the axis of the wheel 5.

In the guideway is movable past the grinding wheel a carriage having means to engage the jaw to be ground in its pivoting hole and thereby confine it against movement eXce t around the axis of such hole and against t e grinding wheel or member and also having means, removed from the first means, to clamp the jaw as it will then be positioned. To this end 7 is a slide forming the body of the carriage and having a pair of spaced arms or projections 8 which project through the plane of the wheel 4 and are provided with pairs of holes 9 and 10, the holes in each pair being horizontally alined with each other. Either pair of holes is adapted to receive with a snug fit a removable spindle 11. The pairs of holes are offset relatively to each other in a direction through the plane of the grind wheel. On the slide are arms 12 and 13 into which are respectively tapped the thumbscrews 14 and 15, substantially opposed to each other.

, The jaw 16 to be ground is of a well known form, being provided with a hole 16a to receive the pin on which it is pivoted in the body of the clip and with a blade 17 whose acting edge18 is parallel with the axis of hole 16a and is straight and is formed at the convergence of two oppositely beveled surfaces .19 and 20. I'Vith respect to a plane passing through the edge 18 and the said axis of the jaw (i. e., of hole 16a) the planes of these surfaces are not in the same angular relation; the angle as to the surface 19 is more acute, in the present example, than the other angle. (In the particular clip-jaw shown there is a hump 15a on one face of its blade, but that is immaterial.)

In grinding a jaw it is arranged on the spindle 11 which is mounted as shown in Fig. 3 in the arms 8 and penetrates and snugly fits its hole 16a and so maintains its edge 18 in parallelismwith the path of movement of the slide. Assuming that the surface 19 is first to be ground the position of the jaw is as in Fig. l. In that case thumb-screw 14; is manipulated to form a stop for the jaw which will allow surface 19 to wipe the periphery of the grind wheel when the slide is shifted and thumb-screw 15 is made to jam the jaw against thumb-screw 14:, the two screws clamping the jaw and coacting with the spindle to hold it in fixed relation to the slide. The grinding wheel being in rotation the slide is then moved back and forth until surface 19 has been ground. When surface 20 is to be ground the jaw is reversed face for face, as in Fig. 5, spindle 11 being arranged in the holes 10, whereupon screw 15 is used as the stop and screw 14 as the means to jam the jaw against screw 15. In treating a run of the jaws all their surfaces (19 and 20) of one class will usually be treated first and then their surfaces of the other class, so that in each instance the screw serving as the stop may be adjusted once for all.

It is an important feature of the invention that there are two supporting points 9 and 10, in which the spindle may be interchangeably arranged. This makes it possible, notwithstanding the pivoting hole of the jaw is offset to one side of the median plane of the jaw blade as seen in Figs. 4 and 5, to retain each surface 19-20 as reformed perfectly parallel to its original plane.

I realize that it is not new in machines for grinding implements of any kind so as to produce an edge thereon to mount the implement in a slide movable with reference to a rotated grinding Wheel; wherefore what I claim is:

' 1. In combination, supporting means, a grinding member, and a carriage member having a pair of spaced projections and means spanning the projections to engage the jaw to be ground in its pivoting hole when interposed between said projections and thereby confine it against movement except around the axis of such hole and againstsaid grinding member and also having means, removed from the second-named means, to clamp the jaw as thus moved, one of said members being movable past the other.

2. In combination, supporting means, a grinding member, and a carriage member comprising a carrying element having a pair of spaced projections and a spindle removably arranged in said projections and held with its axis in fixed relation thereinand being adapted to snugly fit the pivoting hole in i the jaw to be ground when interposed between said projections and thereby confine it against movement except around the spindle and against said grinding member, said carriage member having means, removed from the spindle, to clamp the jaw as thus moved and one of said members being movable past the other.

3. In combination, supporting means, a grinding member, and a carrying member having means to engage the jaw to be ground in its pivoting hole and pivotally support the jaw in either of two positions in which it shall be reversed face for face and in different angular relations to the surface of said grinding member, said carrying member having means. removed from the second-named means, to clamp the aw upon pivotal movement thereof toward said surface and one of said members being movable past the other.

In testimony whereof I affix my signature.

JOHN E. PETERSON. 

